vocals(not guitar related) :D

ok i have a couple of things to ask and im sort of new to these forums so i dont exactly know the proper way to do this so ill just say it here im 16 and my voice started getting noticeably deeper at age 13 and it still cracks on occasion this i need help with and also i can do deep growls but i cannot scream or my voice cracks and also i can only do very deep growls with very limited range :/ any help would be much appreciated :D